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Disc MC on drum brake. Got my answer

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  • Disc MC on drum brake. Got my answer

    Turns out J and P can be quite helpful, I explained I wanted to use the GMA disk MC on a drum brake, they took it from there.
    wilwood sells an inline residual valve. They recommend 10 psi. I figured to put it past the light switch.
    https://www.speedwaymotors.com/Wilwo...gs,233816.html
    An armed man is a citizen, an unarmed man is a subject!
    When motorcycles are outlawed, only outlaws will have motorcycles.
    Keith

  • #2
    They said it needs to be within 12" of the MC, I was hoping to get to the other side of the brake light switch.
    An armed man is a citizen, an unarmed man is a subject!
    When motorcycles are outlawed, only outlaws will have motorcycles.
    Keith

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    • #3
      Originally posted by hoginedgewood View Post
      They said it needs to be within 12" of the MC, I was hoping to get to the other side of the brake light switch.
      Why other side of bl switch?

      Benny.
      "The future belongs to those who are still willing to get their hands dirty."
      Location: Lynchburg, Virginia USA

      Comment


      • #4
        Originally posted by servi-spoke View Post

        Why other side of bl switch?

        Benny.
        Didn't want to tempt the brake light to stay on.
        An armed man is a citizen, an unarmed man is a subject!
        When motorcycles are outlawed, only outlaws will have motorcycles.
        Keith

        Comment


        • #5
          If you positioned the brake light switch closest to the caliper, you would need at least 10 psi before the lamp lit.

          EDIT: I can't even make sense out of this and I wrote it. What I meant to say is that if a pressure operated brake lamp switch, (BLS) was closest to the caliper, it would have to be rated to close higher than 10 psi, or the lamp would be on all the time. I have always assumed the pressure switches were around 6 psi to switch on. If so, the brake lamp would be on constant.

          You could use a mechanical switch.
          Last edited by newoldguy; 03-20-2019, 08:45 AM.
          The primary and the secondary are on the same side.
          78 FXS 74" 4 speed, 79 FXE basket

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          • #6
            If you have enough residual pressure to keep the brake light on you will probably have brakes dragging.

            Benny .
            "The future belongs to those who are still willing to get their hands dirty."
            Location: Lynchburg, Virginia USA

            Comment


            • #7
              Originally posted by servi-spoke View Post
              If you have enough residual pressure to keep the brake light on you will probably have brakes dragging.

              Benny .
              That Wilwood link from the OP showed 10 psi for drum, and 2 psi for disc brake residual valves. I never knew a disc brake system to use a check.
              The primary and the secondary are on the same side.
              78 FXS 74" 4 speed, 79 FXE basket

              Comment


              • #8
                Originally posted by newoldguy View Post

                That Wilwood link from the OP showed 10 psi for drum, and 2 psi for disc brake residual valves. I never knew a disc brake system to use a check.
                A disk uses them if the mc is lower than the caliper.
                An armed man is a citizen, an unarmed man is a subject!
                When motorcycles are outlawed, only outlaws will have motorcycles.
                Keith

                Comment

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